Malicious PDF — malware analysis report

Static analysis result for SHA-256 92b47ce98418a926…

MALICIOUS

PDF

81.5 KB Created: 2021-09-19 14:58:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cc5139e0d0db5ef66533af9c82933d84 SHA-1: 130d656eba42716bd89d1c3704a64982a25cfdc4 SHA-256: 92b47ce98418a9261f9d9f6dd0bbaa0173123a1b6393be6af5ac04491fdcbdaa
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites acting as a link farm. The presence of these links suggests the document is designed to lure users to external resources, likely for phishing or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://pixomot.ru/uplcv?utm_term=the+caged+system+demystified+pdf PDF link annotation
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/ccf070948bbdabd3575570a2c64bca63/pakuluwajodevuvufuni.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/e4cfeec3ce02b6c29a333105aa7eda59/xoruzujatebo.pdfIn PDF document text
    • http://kancelaria-perfect.pl/app/webroot/media/files/wupewagaketifed.pdfIn PDF document text
    • http://gardensyellowcab.com/admin/images/file/71393279764.pdfIn PDF document text
    • http://dostrojar.sk/UserFiles/file/retudidolumesixejugaziw.pdfIn PDF document text
    • http://rebizplus.com/userfiles/file/donubazasupup.pdfIn PDF document text
    • https://moraure.net/js/ckfinder/userfiles/files/wifukulidizines.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613572666df1a---bukifomisatoxijaxa.pdfIn PDF document text
    • https://ceiling.holcom.vn/webroot/img/files/kepepinopilaviduboba.pdfIn PDF document text
    • https://f2h63c2.ip4secure.net/upload/files/gisezuti.pdfIn PDF document text
    • http://vinabomi.com/uploads/userfiles/file/wojatumufexewer.pdfIn PDF document text
    • https://www.domaine-vrignaud.com/ckfinder/userfiles/files/89578140613.pdfIn PDF document text
    • http://jhdjt.com/images/upload/File/gofubelo.pdfIn PDF document text
    • https://10playsolutions.com/clients/softklk/documents/_articles_/file/3408072485.pdfIn PDF document text
    • https://nayyaralidada.net/alpha/ckfinder/userfiles/files/85865245354.pdfIn PDF document text
    • http://sinostandards.net/upload/files/32513704336.pdfIn PDF document text
    • http://taketty.xyz/js/ckfinder/userfiles/files/75031670773.pdfIn PDF document text
    • https://wrd13.com/force/file/44239545177.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/pt408ufh73gvr04mnjivd40v50/givetazekolivutegifo.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/guzixezikog.pdfIn PDF document text
    • http://sunil.kr/uploadfile/fckeditor/file/88565035900.pdfIn PDF document text
    • https://codefon.hu/js/ckfinder/userfiles/files/jitab.pdfIn PDF document text
    • http://mellorymotors.ru/admin/ckfinder/userfiles/files/50315012995.pdfIn PDF document text
    • https://baruipur.org/ckfinder/userfiles/files/xobir.pdfIn PDF document text
    • https://peisheng.org/uploads/ckfiles/files/61425561c57c1.pdfIn PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/74160811643.pdfIn PDF document text
    • https://kuraniterbiye.com/resimler/files/65809722358.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d84c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD84C 10776 bytes
SHA-256: fca89c083f9940090925bd098f7d9fe7c75795bb66ec9fe49ce35b1e83b1a3a4
font_01_sfnt_off0000f0fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001090d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1090D 17556 bytes
SHA-256: 1d941b09ee23ea13faaf4601321c9e9e46d8a9691fa5768896c4e035efe87ac3

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